Recently tried to upgrade a Mac OS X Mini Server 2001 to Mac OS Sierra 10.12.6.
Sierra OS software was installed and booted OK but could not get any network connection. iCloud connection could not be reached and thus could not sign into iCloud to setup accounts upon reboot.
Little Snitch for Mac OS is a great little gem to protect your data from being sent out to third-party apps through the Internet. For instance, you can use Little Snitch to hamper the outgoing traffic and block websites and apps that require access to the data stored on your Mac.
I had Little Snitch 3.7 running prior to install and installed Sierra over it. However, upon reboot after the Sierra upgrade, Little Snitch was not allowing any application to communicate with the internet. Network diagnostics showed Wifi, Ethernet, and iPhone hotspot as having five green lights and making a successful internet connection.
After uninstalling Little Snitch and rebooting, internet access became available.
It may be wise to uninstall Little Snitch firewall prior to performing a major upgrade in OS X and then reinstall after.
![Mavericks Mavericks](/uploads/1/1/7/8/117873083/196835493.png)
- Little Snitch is a popular Mac app that detects outbound connections and lets you set up rules to block those connections. Once installed, Little Snitch monitors your internet traffic and every time it detects an outbound connection, for example, Adobe Reader trying to access the internet, it pops up a window and ask you if you want to allow the connection one time, or make a rule to allow.
- The Internet is a terrifying place, and Objective Developmentās Little Snitch 4 ($45) has tried for many years to help keep your Mac locked down by monitoring connections and letting you control.
macOS Sierra (10.12.6)
Little Snitch Mac Mavericks Shortcut
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